US 11,860,342 B2
Optical imaging system including seven lenses of +-+-++- or +-+--+-refractive powers
Il Yong Park, Suwon-si (KR); Hyo Jin Hwang, Suwon-si (KR); Yong Joo Jo, Suwon-si (KR); and Min Hyuk Im, Suwon-si (KR)
Assigned to Samsung Electro-Mechanics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electro-Mechanics Co., Ltd., Suwon-si (KR)
Filed on Jan. 23, 2020, as Appl. No. 16/750,052.
Claims priority of application No. 10-2019-0127853 (KR), filed on Oct. 15, 2019.
Prior Publication US 2021/0109320 A1, Apr. 15, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical imaging system, comprising:
a first lens, a second lens, a third lens, a fourth lens having negative refractive power, a fifth lens havmg negative refractive power, a sixth lens, and a seventh lens, sequentially arranged from an object side,
wherein f3/f>1.5, where a focal length of the third lens is f3, and an overall focal length of the optical imaging system is f,
the sixth lens has a concave image-side surface in a paraxial region,
TTL/(2*Img HT)<0.7, where a distance on an optical axis from an object-side surface of the first lens to an imaging plane of an image sensor is TTL, and half of a diagonal length of the imaging plane of the image sensor is Img HT,
Fno<1.9, where an F-number of the optical imaging system is Fno, and
|f4/f|>3.0 and f6/f>0, where a focal length of the fourth lens is f4, a focal length of the sixth lens is f6, and an overall focal length of the optical imaging system is f.